Holocentric chromosome behaviour in Cuscuta (Cuscutaceae).
The extensive karyological differentiation in the Juncaceae is particularly attributed to the presence of a specialized condition: holocentric chromosomes (sometimes referred to holokinetic chromosomes or chromosomes with diffuse kinetic activity).
There exist many speculations about the primitive or derived state of holocentric chromosomes (recently summarized by Mola & Papeschi, 2006).
Older studies of Chakravorti (1948a, b) reported holocentric chromosomes in monocot families Cannaceae, Musaceae and Zingiberaceae.
The structure and behavior of holocentric chromosomes have been described in different Luzula species previously, but mostly in Luzula elegans as a model species with the lowest chromosome count (2n=6) and the largest chromosomes within the family.
Multiple locations of the rDNA sites in holocentric chromosome
of Rhynchospora (Cyperaceae).
Ultrastructural characterization of the sex chromosomes during spermatogenesis of spiders having holocentric chromosomes
and a long diffuse stage.
C-heterochromatin polymorphism in holocentric chromosomes
of Triatoma infestans (Hemiptera-Reduviidae).
Holocentric chromosomes are also often described as polycentric or possessing a diffuse centromere.
Coordinated research on fundamental questions regarding chromosome evolution in sedges will both illuminate diversification patterns in one of the most diverse angiosperm clades and do much to explain how chromosome evolution operates in other organisms with holocentric chromosomes, few of which have been studied.
No obvious variation in chromosome structure accounts for the substantial karyotypic variability in Carex relative to other genera of the Cyperaceae and many other organisms with holocentric chromosomes (Dernberg, 2001).
Such work would be of broad interest for biologists working on organisms with holocentric chromosomes, as relatively few genomic studies have been undertaken in organisms with holocentric chromosomes (Albertson, 1993; Wang & Porter, 2004).